Pump mechanism



Patented Nov. 421,1939

PATENT oFFicE PUMP MECHANISM Paul B. Barnett and Clarence G. Upton,

Tex.; said Upton assigner to `lohn P. Muller,

Fort Worth, Tex.

Application September 8, liiltfs, Serial No. 228,986

' 's claims. (ci. vimi-nio) the device positioned within e portion` or tubing `This invention relates to pumps and pumping equipment and it has particular reference to oil well pumps especially adapted to the production of oil in areas where the petroleum is impregnated with sand and its principal object resides in -the provision of an assembly of parts combined into a compact unit. capable of ,being installed or removed from the well without pulling the tubing yet aiording an eiilcient medium through which maximum production can be maintained under most unfavorable substrata conditions.

Another object of the invention is manifest in the provision of apumping unit wherein is employed a combination of elements through which many of the conventional features of ordinary pumps are eliminated and whereby greater efiiciency' and economy in operation will result since the normal wear, under conditions commonly regarded as extremely diiiicult, is greatly minimized and which is due mainly to the provision of packing rings of a novel design and arrangement.

stili another object ofthe invetion resides in the provision of a pump of the character 'described embodying certain features of self lubrication whereby considerable of the wear on the working parts is eliminated and thus the device may be operated a longer duration of time without attention.

Yet another object of the invention resides in the provision 'o'f `a pump assembly especially adapted to the production requirementsin areas producing lightgravity petroleum and which, due to 'its peculiar characteristics, cannot be economically handled by equipment employing conventional cups because oi the usual slippage and loss occasioned by the use oi such equipment. Moreover, high gravity oil or oil having a light body possesses little lubricating qualities and` it becomes necessary to provide other means for lubrication of the parts. Such oil often contains injurious chemical properties which react unfavorably upon conventional cups.. i

Broadly, the invention seeks to comprehend the provision ofa pump for producing oil possessing many novel features conducive to greater economy `in operation and endurance' as 'well as aording a unit capable of installation and removal with the minimum of eii'ort and expense. While the foregoing objects are paramount, other and lesser .objects will become manifest as the description proceeds taken in connection with the appended drawing wherein:

Figure l. is a fragmentary elevational view of tioned within a 5, which may be of the ball check type, threaded lines 3-3 of Figure'i, and

Figure 4 is a modification wherein the check valve which cooperates with the plunger is posihold down assembly.

Continuing of the drawing, the numeral i -geneiallydesig-v nates a section of tubing or casing which has at its lower end a shoe 2 for supporting a hold down assembly3.

A hollow or tubular plunger 4 is threadedly 15 secured to. the hold down 3, thus providing a communication with the lower part oi' the well.

'I he'upper end of the plunger 4 has a checkA valve thereon, as illustrated in Figure 2.

A tubular shell Tor housing 6 encloses the upper portion oi' the plunger 4 and has a ball check 'l threadedly attached at its upper end, the latter being provided with threads 8 forl engagement with the lower end of a string of sucker rods, 25

not shown.

Animportant feature of the device lis a grease chamber 9, the latter being formed by threadedly attachinga pair'of bushings I0 and Il within the shell l. The upper bushing III is provided 30 with external threads l2 and Il at its upper and lower ends and has' an annularrecess i4 r,in `which there is positioned a spring I5 which urges a junk ring I6 I ipwardlyvagainst` annular packing rings Il, the latter being retained in place by a threaded packing gland |8- in the upperend o; the said bushing.

The lower bushing Ii is threaded to the lowermost end of the shell 6 and likewise slidably engages the plunger 4.` The lower end of the bushing. il is provided with a I arger packing gland is'and has-opposingly arrangedA wings 20 integral witliits lower side for. engagement with recesses 2l of the hold .down-assembly 3, as particularly illustrated in Figure 2. Another annular rcesss22 is provided within theJowerbush-` ing Il and has a spring 23 positioned around thel within the chamber s thereis'formed e heir do of internal flanges 26 integral with the shell 6. the purpose of which is to engage springs 2l for urging a .pair of junk rings 28 against annular packing rings 29. 'I'he bushings 'i0 and Il provide stops against movement 'otthe packing '29l 55 with a more detailed description 10.

thereby causing the latter to slidably engage the plunger 4 and thus sealing the chamber 9.

A pair of plugs 30 and 3l are threadedly engaged within the wall of the shell 6 between the flanges 26, one of which is used for injecting lubrication Within the chamber 9, whereas the other plug is removed during the lling operation to allow air to escape.

The modification illustrated in Figure 4 differs from the structure shown in Figures 1 and 2 in that the ball check 5 is eliminated from the upper end of theplunger 4 and is provided with a conventional check of another type 32 within the hold down assembly 3. Obviously,` the ball check' 32 may be positioned below the hold down assembly 3 at any-desirable elevation within the tubing l.

In operation parted to the shell 6. The shell valve 1 is autmatically closed and the liquid is drawn through the plunger 4 and its check 5 or 30, into the` upper portion of the said shell. In the downward movement the contents of the upper portion of the shell close the plunger valve 5, thus expressing the liquid out through the shell check 1 and into the tubing I. Since the plunger 4 is spaced from the shell 6, the sand in the oil cannot affect the working parts except at the packing. The .outer packing Il and 25 clears the plunger of excess sand, thereby preventing undue wear on the packing 29 within the chamber 9.

Manifestly, -the structure herein shown and described is capable of considerable changes and modifications from time to time by those skilled in the art and such changes and modiflcationsas maybe resorted tofalling within the spirit and intent of the invention may also be considered as falling within the scope of the appended claims.

What is claimed is:

1. In a pump for oil wells having a stationary tubular plunger and a hold down assembly, a tubular housing operatively receiving the said plunger and adapted to reciprocation thereon, a grease chamber in the said housing around the a lreciprocating movement is imsaid plunger, packing arranged in each'ed'of' the said grease chamber, check valves on the upper ends of the said plunger andthe said housing and resilient retaining means for the said packing in the said chamber.

2. In combination with a string of rodsand a pump for oil wells the said pump having a stationary tubular plunger attached to a hold down assembly and a reciprocating shell secured to the said rods receiving the said plunger, a grease chamber in the said shell around the said plunger, means closing each end of the saidV grease chamber, packing secured in each end of the said chamber and tension means retaining the said packing in circumferential engagement with the said plunger. l

3. In combination with a string of rods and a pump for an oil well, the said pump having a stationary plunger anda shell attached to the said rods and slidably embracing the said plunger, a grease chamber in the said shell around the saidplunger, packing arranged in each end of the said grease chamber and means within the said chamber urging the said packing into engagement yviththe said plunger.

4. In an oil well pump adapted for operation wtha string of rods, the said pump having a stationary plunger attached to a hold down assembly and a reciprocable shell operating ,on the said plunger and attached to the said rods, a grease chamber in the said shell, packing arranged in each end of the said chamber and tensioned means bearing against the said packing urging the same into circumferential engagement with the said plunger.

5. In an oil well pump and a string of rods, the

said pump comprising a stationary plunger and a hold down assembly and a reciprocating shell attached to the said rods receiving the said plunger, a grease chamber in the said shell, packing means positioned in each end of the said chamber adapted to engage the said plunger and tensioned means bearing against the said packing.

PAUL B. B

CLARENCE G.

UPTN. 

